package com.hospital.servlet;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

@WebFilter(urlPatterns = { "/*" })
public class CharacterEncodingFilter implements Filter {
	//实现拦截器类的Servlet的方法
	protected String encoding = null;
	protected FilterConfig filterConfig = null;

	public CharacterEncodingFilter() {}
	
	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
	}
	
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		chain.doFilter(request, response);
	}
	
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}
}